How is water gas formed ?

Explanation

**Step-by-Step Solution:**

1. **Definition of Water Gas**: Water gas is a mixture of two gases: carbon monoxide (CO) and hydrogen (H2).

2. **Formation Process**: Water gas is produced through a chemical reaction involving carbon and steam.

3. **Materials Required**: The primary materials needed for the formation of water gas are:
- Red hot coke (a form of carbon)
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